<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <!-- 购物车展示商品的地方 -->
        <ul
          class="cart-list"
          v-for="(good, index) in shopCartList.cartInfoList"
          :key="good.id"
        >
          <li class="cart-list-con1">
            <input
              type="checkbox"
              name="chk_list"
              :checked="good.isChecked == 1"
              @change="updateChecked(good, $event)"
            />
          </li>
          <li class="cart-list-con2">
            <img :src="good.imgUrl" />
            <div class="item-msg">{{ good.skuName }}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ good.skuPrice }}.00</span>
          </li>

          <li class="cart-list-con5">
            <a class="mins" @click="changeSkuNum(good, 'minus', -1)">-</a>
            <input
              autocomplete="off"
              type="text"
              minnum="1"
              class="itxt"
              :Value="good.skuNum"
              @change="changeSkuNum(good, 'change', $event.target.Value * 1)"
            />
            <a class="plus" @click="changeSkuNum(good, 'add', 1)">+</a>
          </li>

          <li class="cart-list-con6">
            <span class="sum">{{ good.skuNum * good.skuPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a class="sindelet" @click="deleteCart(good)">删除</a>
            <br />
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" 
        @change="updateAllChecked($event)"
        :checked="isAllChecked"/>
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteCartByChecked">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">
          已选择 <span>{{ totalCount }}</span
          >件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalPrice }}</i>
        </div>
        <div class="sumbtn">
          <a class="sum-btn" href="###" target="_blank">结算</a>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
//获取购物车的数据，简化数据getters
import { mapGetters } from "vuex";
// 节流
import throttle from "lodash/throttle";
export default {
  name: "ShopCart",
  //组件挂载完毕---获取一次购物车列表数据
  mounted() {
    this.getCartList();
  },
  methods: {
    //获取购物车列表方法
    getCartList() {
      //派发action
      this.$store.dispatch("getCartList");
    },
    // 修改商品个数
    changeSkuNum: throttle(async function (good, type, disNum) {
      let skuId = good.skuId,
        skuNum;
      switch (type) {
        case "add":
          skuNum = disNum;
          break;
        case "minus":
          skuNum = good.skuNum > 1 ? -1 : 0;
          break;
        case "change":
          if (isNaN(disNum) || disNum < 1) {
            skuNum = 0;
          } else {
            skuNum = parseInt(disNum) - good.skuNum;
          }
          break;
      }
      try {
        await this.$store.dispatch("addOrUpdate", { skuId, skuNum });
        this.getCartList();
      } catch (error) {
        alert("修改失败");
      }
    }, 500),
    // 修改勾选状态回调
    async updateChecked(good, $event) {
      // 考虑发送什么携带的参数 skuId, 勾选状态[0:未勾选,1勾选]
      let skuId = good.skuId,
        isChecked = $event.target.checked ? "1" : "0";
      try {
        await this.$store.dispatch("updateChecked", { skuId, isChecked });
        this.getCartList();
      } catch (error) {
        alert("修改失败");
      }
    },
    // 删除某个商品 deleteCart
    async deleteCart(good) {
      let skuId = good.skuId;
      try {
        await this.$store.dispatch("deleteCart", skuId);
        this.getCartList();
      } catch (error) {
        alert("删除失败");
      }
    },
    //修改全部商品的选中状态
    async updateAllChecked($event) {
      //携带的参数:0|1
      let isChecked = $event.target.checked ? "1" : "0";
      //派发一个action,修改全部的商品勾选状态
      try {
        //await：Promise.all返回的结果【每一个修改状态的promise，只有大家都成功才算成功，有一个失败即为失败】
        await this.$store.dispatch("updateAllChecked", isChecked);
        this.getCartList();
      } catch (error) {
        alert("修改失败");
      }
    },
    // 删除选中的商品
    async deleteCartByChecked(){
      // 派发一个action
      try {
        // 删除选中成功的商品
        await this.$store.dispatch("deleteCartByChecked");
        this.getCartList();
      } catch (error) {
        alert("删除失败")
      }
    }
  },
  computed: {
    ...mapGetters(["shopCartList"]),
    cartInfoList() {
      return this.shopCartList.cartInfoList || [];
    },
    //计算一共多少个商品
    totalCount() {
      //累加
      let sum = 0;
      //遍历数组，累加每一个商品的个数
      this.cartInfoList.forEach((item) => {
        sum += item.skuNum;
      });
      //返回结果
      return sum;
    },
    //计算出将来需要结算总价格
    totalPrice() {
      //累加
      let sum = 0;
      //遍历数组，累加每一个商品的个数
      this.cartInfoList.forEach((item) => {
        sum += item.skuNum * item.skuPrice;
      });
      //返回结果
      return sum;
    },
    isAllChecked(){
      return this.cartInfoList.every((item) =>item.isChecked=='1')
    }
  },
};
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con3 {
          .item-txt {
            text-align: center;
          }
        }

        .cart-list-con4 {
          width: 10%;
        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>